Sheep shear



,19%. M'W CARDLE 1,723,364

SHEEP SHEAR Filed March-l8, 1927 2 Sheets-Sheet 1 Aug. 6, 1929. w, MCARDLE 1,723364 SHEEP SHEAR Filed March 18, 1927 2 Sheets-Sheet 2v Patented Aug. 6, 1929 UNITED STATES MICHAEL W. MCARDLE, OF CHICAGO, ILLINOIS.

SHEEP SHE/AR.

Application filed March 18, 1927. 'Serial No. 176,377.

The purpose of this invention is to provide in a power driven shee shear and like implements, guidance for t e reciprocated bladeagainst movement on the fixed blade calculated to defeat the tendency of the driving means, which usually comprises a crank and cam, to sway or slightly oscillate the re: ciprocated blade transversely of its path of reciprocation, which tends to cause lateral wear on the guide feature travelling thereln toward the middle portion of the length and thereby render the cutting value of the stroke variant as between the middle and the end portions of the fixed blade or comb.

A further purpose of the invention is to provide replacement parts for the Wearing surfaces involved in the service of the rcciprocating blade. It consists in the elements and features of construction shown and described as defined in the claims.

In the drawings:

Figure 1 isa fore-and-aft section of a power driven sheep shear embodying this invenmade from the blanks shown in Figures 6, 7 y

and 8 respectively.

Figure 12 is a detail perspective view showing the wearing parts represented in Figures 10 and 11 in their working positions with respect to the blade.

Referring to the drawings; the fixed casing of the shear is indicated at A; the power shaft is indicated at B having a crank memher, 13 with a crank wrist, b. The fixed blade or comb is indicated at D; the reciproeating blade is indicated at E; F is a cam plate carried by the reciprocating blade having a vertical slot 7 which is engaged by the crank Wrist Z9 of the power crank B. The parts described are held in assembled relation by a bolt G inserted from the under side through the fixed blade in which the squared shoulder, g, of the bolt engages the square aperture in the blade, the bolt extending up through the reciprocating blade which is apertured as seen at, e, to permit reciprocation, and thence through the fixed casing, A, above which the bolt protrudes for receiving a spring, G and nut, G above the spring for adjusting the spring to proper tension for holding the parts in the necessary snug relation to each other for effective shearing action of the blades.

The reciprocation of the blade IE, it will be understood, is effected by the engagement of the crank b in the slot 7' of the cam plate F, said cam plate being mounted rigidly on the reciprocating blade E. The blade E has a forwardly facing longitudinally extending shoulder 20 which cooperates with downwardly extending projections 21 at the forward edge of the casing, said projections be ing situated at the opposite ends of the downwardly projecting flange or lip, 25, of said casing, each projection 21 being longer than the cutting stroke of the blade E. This is a familiar construction for affording guidance for the reciprocating blade with a tendency to counteract somewhat the tendency of the crank and cam drive described, to sway or oscillate the reciprocating blade transversely of'its direction of stroke as the crank wrist encounters the cam slot alternately at the opposite sides for giving the blade its operative stroke. This expedient. for preventing theoscillation of the blade has not been found satisfactorily effective because the vertical lane of-the guidance of the reciprocating b aide afforded by the projections 20 is so far offset forwardly from the vertical plane of action of the crank wrist as to create a leverage in favor of the frictional engagement of the crank wrist with the cam faces operating alternately for swinging opposite ends of the cutter back and forward.

In the present construction this defect is obviated by providing guidance for the reciprocating blade upon the fixed blade directly in the vertical plane of actuation of the blade by the engagement of the crank wrist with the cam. For this purpose, the fixed blade has two aligned apertures, 3030, near its opposite ends which are engaged by do wnwardly extending projections, 35-35,which may be considered projections of the reciproeating blade, but which are in fact formed as projections from the cam plate, F, at the Op 110,

upon the under side of the lined blade,

posite ends thereohsaid projections extending through the reciprocating blade, and constituting part oi the means of securing the cam plate to said fixed blade rigidly, as stated, such securement being further eliected by tenons, 3 i3, entering registered ape tures, 33-33, in the middle part of the lengt 1 of the blade, and a screw, 36, at the middle of the length or the blade engaging the cam plate at the lug, 39, infoldcdat the lower end of the cam slot, The projections, 35 35, it will be seen, are positioned srfbstantiall in the vertical plane ot' encounter of the cram; wrist with the sides of the cam slot for actu tendency to oscillation of the i plane of its cutting action resulting rem the driving action of the rank wrist.

Further details of the construction consistent with this feature, comprise the engagement of the lined blade with the casing. This engagement is effected by the downwardly extending projections at the the casing engaging apertures, 5l5l, and the provision on the rear edge of the casr intermediate the two projections, 50, oi a slight downwardly curred jection, 53, on which the fixed blade may rock slig manner and degree which is permitted l, fit or" the projections, 5l51, in the aper; 1 5252, or the plate. This feature is familiar in tools of this character and is not apart ot the present invention except that the present invention consists in this feature so that neither prevents the "functioning of the other. The second feature of the present inv tion consisting in the provision of replaceable wearing parts at the slide bearings and engagements for guidance of the reciprcca" blade, comprise the following, which will be described in the order of their probable relative importance.

For efiectively preventing the oscillation of the reciprocating blade, it win. be obvious that play or possil irity of movement the blade with respect to the projections, which engage the slots, 30, laterally with respect to those slots, must be kept at the mir mum consistent with the sliding movement of the projections in the slots; and it will be lateral obvious that a very limited amount of wear in the slots tending to widen them will be fatal to the tunction of the construction for preventing oscillation of tire blade, also that such wear will be very difiicult to correct; and in fact, cannot be corrected without drawing the temper or the blade and subjecting itto some means for upsetting the metal around the slots. This is an impractical method and it is therefore very important to provide other means tending to prevent wear of the )ro'ections upon the sides oi the slots.

For this purpose, there is shown mounted thin steel stamping, J, made from quite rear edge of sheet steel blank, seen in Figure 6, which formed by cutting the metal at lines, and 6e, and striking the metal up to term parallel upstanding lips or lugs, 6'?67, and torming an aperture, 68, etween them, said lugs or lips being dimensioned and spaced apart -for entering and fitting in the slots, 3030, respectively, when the stamping is applied upon the under side of the blade, D, to which it is held by lu s, 5858, folded up at the ends oi said stamping tor clasping the ends ofthe blade D, said blade being formed with slightly beveled notches, 59 59, for engagement of the upturned lugs, 58 58, the latter leaning slightly inward for engagin the beveled ed es oi the notches into which the elasticity of the stamping permits the said upturned lugs to be snapped in applying the stamping to the blade as described. It will be understood that when this stamping, serving a wear piece, is apolied to the blade, the slots in which the upstruck lugs center for lining the same at the sides exposed to wear, v, 'll be made enough wider than the projecions, 35, which engage the slot, to accommodate the said lining lips of the wear piece, which n ll be suitably spaced apart to admit the urojeciions, 35, between them.

A removable and replaceable wear piece on the rec 1 locating bladeat its path 0t sliding :rth and pressure against the pro- 2l-2l, at the ends of the lip, oi'

- is provided, formed from the t in short steel blank, 70, shown in Figure 7,wh1ch is iolded at the dotted line, 71, into rig i r l 1 form dimensioned 'lor lodgement in the angh between the upper face of the blade E and th shoulder, 20, by which the blade is stop Jed against the projections, 2l21, said wear piece being removably held to the blade, E, by downturned lugs,?272, at its opposite ends, which engage slightly beveled undercut notches, ?5, former at the ends of the blade E, the said lugs being slightly inclined wholly formed as part of the casting, their wear beyond a certain degree necessitates replacing the entire casing. It is therefore very desirable that the pressure and wearl'GCQlVlng projections should be made separate "from the casting so as to be removable and replaceable. This is accomplished by forming the projections substantially as to their entirety by means of clips, -80, made of suitably dimensioned blanks of steel shown in Figure 8, which is folded at dotted lines, 81-81 into channel form dimensioned for embracing the lip, 20, of the casing and having struck inward "from both flanges of the channel, pointed projections, 82.82, which engage correspondingly slight countersinlis, 8 l-84, made in the face oi? the casing so that these clips may be snapped onto the lip 21, and retained thereon safely against displacement during use.

It will be understood in respect to all the wear pieces above described that when they become sufliciently worn to impair the operation of the tool, they can be manually re moved and discarded, and replaced by duplicates which will be furnished with the tool for such substitution, thereby dispensing with the necessity for refitting or replacing the worn parts of the tool which could be done only at much greater cost.

I claim:

1. In a sheep shear and like tool having fixed and reciprocating blades co-operating for shearing, a casing in which they are mounted for reciprocation one upon the other, and parts alltording sliding engageinent between said blades for guidance of the reciprocating blade upon the fixed blade comprising a sheet metal. wear piece removably engaged with the fixed blade and positioned for such engagement substantially in the plane of the cut at the intersection therewith of the vertical plane of the engagement of the reciprocating blade for actuation, said slide engagement being effected by longitudinally extending slots in the fixed blade and projections from the reciprocating blade engaging said slots, and the wear piece consisting of a sheet metal strip applied to the under side of the fixed blade having lips struck up into the slots forlining the latter at its opposite longitudinal sides and having lugs at the ends folded up for engagement with the ends 01 the blade.

2. In a sheep shear and like tool having fixed and reciprocating blades co-operating for shearing, a casing in which they are mounted for reciprocation one upon the other, and parts atl'ording sliding engagemcnt between said blades for guidance of the reciprocating blade upon the fixed blade comprising a sheet metal. wear piece removably engaged with the fixed blade and positioned for such engagement substantially in the plane of the cut at the intersection there with of the vertical plane of the engagement of the reciprocating blade for actuation, said slide engagement being eii'ected by longitudinally extending slots in the fixed blade and projections from the reciprocating blade engaging said slots, and the wear piece consisting oi a sheet metal strip applied to the under side of the fixed blade having lips struck up into the slots for lining the latter at its opposite longitudinal sides and having lugs at the ends folded up for engagement with the ends of the blade, the latter having notches at the ends for engagement by said upturned lugs.

3. In a sheep shear and like tool having fixed. and reciprocating blades co-operating for sl'icaring, a casing in which they are mounted for reciprocation one upon the other, and parts atllording sliding engagement between said blades for guidance of the reciprocating blade upon the fixed blade comprising a sheet metal wear piece reniovably engaged with the fixed blade and positioned for such engagement substantially in the plane of the cut at the intersection therewith of the vertical plane of the engagement of the reciprocating blade for actuation, said slide engagement being affected by longitudinally extending slots in the fixed blade and projections from the reciprocating blade engagin said slots, and the wear piece consisting or a sheet metal strip applied to the under side of the fixed blade having lips struck up into the slots for lining the latter at its opposite longitudinal sides and having. lugs at the ends folded up for engagement with the ends of the blade, the latter having beveled shoulders at the ends for engagement of said upti'u'ned lugs, the latter being slightly inclined inwardly correspondingly to the bevel oi. said. shoulders.

4. In a sheep shear and like tool, compris ing a casing, a fixed blade thereon, and a reciprocating blade mounted therein for cooperation with the fixed blade, means for holding the blades yieldingly in shearing contactwith each other, the reciprocatingv blade having a longitudinal guide shoulder and the casing having a longitudinally extending lip bearing upon the reciprocating blade for receiving the pressure bywhich the two blades are held in contact and cooperat- .ing with said guide shoulder in the reciprocation of the blade a removable wear piece at the slide bearing of the reciprocating blade a ainst said hi consistin of a sheet steel strip having at its ends lugs folded to clasp the ends of the reciprocating blade, the latter having notches for engagement of said clasping lugs.

5. In a sheep shear and like tool comprising a casing, a fixed blade thereon, and a reciprocating blade mounted thereon for cooperation with the fixed blade, means for holding the blades yielding'ly in shearing contact witheach other, the reciprocating blade having a longitudinal guide shoulder and the casing having a longitudinally extending lip bearing upon the reciprocating lade for receiving the pressure by which the two blades are held in contact and cooperating with said guide shoulder in the reciprocation of the blade for the slide hearing of the casing lip upon the reciprocating blade and its guide shoulder consisting of a sheet metal strip folded in angular form for fitting the angle between said shoulder and the at its opposite endportion consisting of sheet metal channel-formed clips adapted to be applied over the lip, said clips and the lip being cooperatively formed for snap engagement of the clips with the lip.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois this 15th day of March, 1927.

MICHAEL V. MCARDLE. 

